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My ‘85 k20 came with a 7-1/2’ Meyer plow. It had the stock reverse arch springs up front. They were sagging pretty good, but not quite on the bump stops. I added a helper leaf to the packs before I lifted it and it seemed to work well.

Engine wise, almost anything will do. Plowing is more about skill, planning, and momentum when needed. Raw power will break things. Especially when it gets wet and heavy. My dad once advised, better to stall the motor than burn up a tranny or snap a shaft.

There’s a gentleman in Alaska with a build thread about his k30 plow truck running an in-line 6. It had some good info on a plow truck setup.

If you go with a V8 plan not to use long tube headers. I installed them on mine before the lift and it was in constant contact with the front drive shaft with the plow raised.